There are 2160 tokens in the game. To get to the max of Level 11, you need 2000 tokens. Guess the last 160 can just sit there, or you can get them for no benefit. When you collect 1000 tokens you reach Level 10, and you get small red dots on your mini-map that show you where all the remaining tokens are, which is a nice touch. You get the Heroic Accumulation Achievement when you collect 1080 of them.
I am at Level 10 with over 1300 tokens collected so far. They are so freaking addicting, because they are everywhere, and the speeds just get crazy as you upgrade. I hope the jump between Level 10 and 11 is noticeable and worth it -- Spider-Man 2's jump from swing speed 7 to 8 took a lot of work, but there was an immediate large increase in speed that you got from it.
I just got my 2160th one. I got nothing. It's weird, as after you get your 2000th, if you go to the status screen it says "160 until next level". But of course, after I got the 160th one it says "0 until next level".